基于激光传感器的涡轮叶片气膜孔轴线方向检测算法  

Measurement of Axial Orientation of Film Cooling Holes of Turbine Blade Based on Laser Sensor

作　　者：张敏 闫晓燊 奚学程[1] 赵万生[1] ZHANG Min;YAN Xiaoshen;XI Xuecheng;ZHAO Wansheng(State Key Laboratory of Mechanical Systems and Vibration,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学机械与动力工程学院机械系统与振动国家重点实验室,上海200240

出　　处：《电加工与模具》2022年第4期24-29,35,共7页Electromachining & Mould

基　　金：国家自然科学基金项目(51775341,52075333)。

摘　　要：考虑到涡轮叶片气膜冷却孔轴向检测的技术难题,针对人工目视比较法存在的检测效率低、精度差等问题,提出一种基于改进高斯映射的轴线方向检测新方案。首先,利用线激光平台扫描获取叶片表面激光点云数据;然后,针对传统高斯映射算法存在的法矢量求解精度低、实测点云数量少等问题,分别提出了基于母线点云法矢量特性的高斯映射变换处理算法,以及法矢量精度提升算法;最后,基于Geomagic及检测实验对该算法进行了原理可行性、精度可靠性验证。实验数据表明,本算法的轴线方向提取精度可达0.6290°。Considering the technical difficulties in the detection of the axial orientation of a film cooling hole of an aero-engine turbine blade and the problems of low detection efficiency and poor accuracy in the manual visual comparison method,this paper proposes a method for measuring the axial orientation based on an improved Gaussian mapping algorithm.First,a point cloud is obtained through a laser scanning sensor.Then,to address the problem of low accuracy of normal vector in traditional Gaussian mapping algorithms and low number of measured point clouds,a Gaussian mapping transformation algorithm based on normal vector characteristics is proposed,which takes cylindrical generatrices into consideration.Furthermore,an augmented normal vector algorithm for axial orientation measurement effect are also included.Finally,based on geomagic and actual detection experiments,the algorithm is verified for its feasibility,accuracy and reliability.Experimental results show that the extraction accuracy of the algorithm in the axial orientation can reach 0.6290°.

关 键 词：气膜孔轴向检测 高斯映射算法 法矢量高斯球 圆柱点云母线 三维激光点云 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]